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Got one of those LT4 ESC's (GM parts cals it an Electronic Spark Control module) sittin' on my garage shelf. In that article I fall into the "Didn't notice much difference" category. I've taken scan-recordings of my car with Datamaster (before the battery in my POS 1 yr old HP laptop died), and not seen any extra knock counts except for the usual bunch that get read when 1st you start up the car. Didn't see any retard in some WOT runs during the recording. Which is why, I am sure, I fall into that "Didn't notice much difference" category.
However, I'm keeping it around for when I do 1.6rr's and springs etc. I'll need it then.